Use Chrome Headless browser instead of PhantomJS

test/unit/index.js

@@ -1,10 +1,6 @@
 import Vue from 'vue';
 Vue.config.productionTip = false;
 
-// Polyfill fn.bind() for PhantomJS
-/* eslint-disable no-extend-native */
-Function.prototype.bind = require('function-bind');
-
 // require all test files (files that ends with .spec.js)
 const testsContext = require.context('./specs', true, /\.spec$/);
 testsContext.keys().forEach(testsContext);

test/unit/karma.conf.js

@@ -11,7 +11,7 @@ module.exports = function (config) {
     // 1. install corresponding karma launcher
     //    http://karma-runner.github.io/0.13/config/browsers.html
     // 2. add it to the `browsers` array below.
-    browsers: ['PhantomJS'],
+    browsers: ['ChromeHeadless'],
     frameworks: ['mocha', 'sinon-chai'],
     reporters: ['spec', 'coverage'],
     files: ['./index.js'],